How to connect generator to house without a transfer switch?

How to connect generator to house without a transfer switch?
How to connect generator to house without a transfer switch

Whether you have a portable generator or a standby generator at home, they likewise offer two options, automatic or a manual transfer switch installed with the electrical wires.

Whether you have a portable generator or a standby generator at home, they likewise offer two options, automatic or a manual transfer switch installed with the electrical wires.

Generator connected to house with out a transfer switch!
Generator connected to house with out a transfer switch!

However, in case of their absence, here is a guide to connect generator to house without a transfer switch.

Before connecting, you should know that there is a classification for transfer switches, too which is

Types of Transfer Switches

The transfer switches are classified into three types through which you can connect a generator to a home without a transfer switch. This includes an interlock kit, manual transfer switch, and automatic transfer switch.

Interlock Kit

The interlocking kit connects directly to the main circuit breaker panel in the home. It provides the user with the ability to safely energize their generator without the need for a transfer switch. They are inexpensive and less complicated.

Transfer switch

In most cases, an interlock kit uses a mechanical linkage that allows the user to manually connect the main breaker in their home’s circuit panel directly to the generator’s output terminals. This type of connection eliminates any possibility of back-feeding electricity from the generator into the power lines, which can be dangerous and illegal in many areas.

Manual Transfer Switch; MTS

A manual transfer switch operates on the same principle as an interlock kit, but it allows the user to manually switch between utility power and generator power with a simple handle, device switch, or toggle switch.

Wired Transfer aswitch

Manual transfer switch is typically wired into their own sub panel, which is connected to both the circuit main electric panel and the generator. This type of connection allows the user to easily switch between utility power and generator power without having to manually connect the main circuit breaker in their home’s circuit panel every time.

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Automatic Transfer Switch; ATS

Nowadays, most of the generator transfer switch are automatic. They monitors the power and turns on the generator directly when observes the power outages.

Switches not wired on yet.

It helps connecting generator to house without any extra wiring.

The modern models for the generators, regardless of generator type, comes with automatic transfer switch; ATS or with the manual transfer switch; MTS for immediate power supply.

But, how to connect generator to house when there is no transfer switch? Here is how.

How to connect generator to house?
This can be done either by attaching individual cords or by attaching extension cords.

Which is better transfer switch or the interlock?

The interlock is to isolate circuit from the entire electrical system, significant to avoid arcing and is more common in a household. On the other hand, a transfer switch is used for houses and buildings where there is more than one circuit.

Speaking of which one is better, I think, I would go for transfer switch as it ensures more safety.

How to connect generator to a house without transfer switch?

In order to connect your generator to your home without needing a transfer switch, here is a step-by-step guide for how to wire generator.

Note: While doing so, make sure you have turned off the main breaker to ensure safety.

Generator Plugged in
Generator Plugged in

1.   Drill outlet utility box for generator cables

Find a place and drill an outlet utility box with your oscillating tool. When done, make holes for the wires; they must be bigger than the wires so that they can move freely without damaging the wires.

2.   Installation of a waterproof box

Install the waterproof box to protect the plug from different weather conditions. Make sure to get the right size, preferably a medium to large safety box.

3.   Connecting the wires

Now, the next step is to connect the wire and insert the other end of the wire in a plug which is outside of your house and assemble the outlet kit. With the help of sealants, seal the holes to ensure a waterproof installation.

4.   Testing the generator

The final step is to test the working of the generator. Turn on the generator power and hook it to the inlet. Next, connect the extension cord to the generator and attach your appliance and power consumption tester. Be sure to connect that appliance which is compatible with the generator’s wattage. (How many watts your electrical device require is mentioned on the box or underneath the device).

Can I just plug a generator into an outlet?

If you want to do so, turn off the feed from the power grid first and carefully connect generator to the main circuit breaker box. You can do it yourself, if not then call a professional. It will begin to stream electricity to your house but it would not be more than 15 amps. This electric power supply will stream without tripping the original breaker.

Safety Considerations

No matter how you connect generator to house, it is important that safety measures are taken to prevent potential hazards.

Before connecting a generator to a home, it is important to make sure that all circuit breakers and switches are turned off.

It is also essential to ensure that the generator has been installed according to local building codes and that all wiring connections have been tested for proper operation before turning on any electrical devices in the home.

In addition, it is important to remember that a generator should never be connected directly to the utility power lines. Even if a transfer switch or power inlet box is used, back-feeding electricity into the utility system can cause dangerous situations and can also damage electrical equipment.

Note: Hire a licensed electrician to establish the direct connection to the wire generator to avoid loose wire properly instead of doing it yourself.

Frequently Asked Questions

What is a power inlet box?

It is an outdoor enclosure inlet box that houses the connections between the generator cables and the incoming electrical circuits.

Transfer switch

It is installed beside or near the main panel to install a weatherproof way to connect a generator to your home.

Can you hook up a generator without a transfer switch?

Yes, you can. In that case, you need to connect generator to house by running it on the outdoor-rated extension cord coming from the generator to the house. Some generators also allow multiple extension cords at the same time.

However, to prevent overloading, dedicate a cord separately that draws a lot of power such as space heater and window air conditioner.

Can you run a Generac generator without a transfer switch?

As it is possible to use a generator without requiring a transfer switch when there is a power outage. No wonder it has a great role in functioning the operation properly—making it easy to power the lights. However, in case of its absence, you have to do it manually, and the power supply would be limited from the power outlet. Yet, it also depends on the model you have, whether or not it allows individual or multiple extension cords.

How many appliances can I use with a 3000 Watts generator?

It solely depends on the appliances you have, and if you want to connect, it could be either a portable generator or a standby generator. This can easily cater low wattage lights and some other electrical appliances like laptops, computers, and phone chargers simultaneously.

A generator with 3000 W can run for an extended time. As long as you don't use the maximum generator maximum capacity, you may operate several gadgets and lights.


However, you in case you want to operate a power-consuming gadget such as a portable electric cooktop, it is recommended to run that separately. Otherwise, this will overload and can harm the circuit of your generator.

Before utilizing any household equipment that you doubt uses a lot of power from your backup power source, it's a good idea to perform some basic power usage reviews.

Note:  The wattage, if miscalculated, may result in overloads that are more likely to harm the generator circuit. Therefore, you should consume not more than 2500 to 2800 watts rather than the maximum power rating of 3000 watts. This will shield your generator from harm and increase its life.

What is the significance of transfer switch?

The transfer switch plays a vital role for the flow of electricity in a right direction, for instance, home generator into the power grid. This also prevents the workers for electrical hazards like shock from the home generator.


To connect generator to house without a transfer switch is a simple process that anyone can do with just some basic knowledge of electricity and wiring.

For, that you will need an inlet box, manual transfer switch, and heavy-duty extension cords (read the instructions thoroughly before doing so); you can easily and without breaking the safety measures connect your generator to your home.

I have mentioned the basics, so, by following these guidelines, homeowners can safely connect their generators to their homes and enjoy the convenience of a reliable backup power source.

Note: If you do not have any experience doing electrical work, it is recommended to consult a licensed electrician for help.

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